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Unit 1: Elements & Compounds

Total questions: 61

Worksheet time: 1hrs 12mins

Name
Class
Date
1.
How many Oxygen are in H2O?
a)
1
b)
2
c)
0
d)
4
2.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
3.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
4.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
5.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
6.
A subscript is the small number below a(n) ________ that tells the number of _______ of that element.
a)
element symbol; atoms
b)
atom; element symbol
c)
subscript; protons
d)
compound; elements
7.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
8.

How many different elements are present in H2COCH2

a)

5

b)

4

c)

3

d)

2

9.

Calculate the number of Oxygen atoms in Al(OH)3

a)

1

b)

2

c)

3

d)

4

10.

The ______ are numbers found on the lower right-hand side of an element symbol.

a)

Coefficient

b)

Exponent

c)

Multiplier

d)

Subscript

11.

C3H5(NO3)3

a)

C = 3, H = 5, N = 3, O = 9

b)

C = 3, H = 5, N = 1, O = 9

c)

C = 9, H = 15, N = 3, O = 9

d)

C = 9, H = 15, N = 1, O = 3

12.

H2SO4

a)

H = 2, S = 4, O = 4

b)

H = 2, S = 1, O = 4

c)

H = 8, S = 4, O = 4

d)

H = 2, SO = 4

13.

How many elements are present in hydrochloric acid (HCl)?

a)

1

b)

2

c)

3

14.

Caffeine is represented here: C8H10N4O2 ... How many atoms are present?

a)

4

b)

18

c)

24

d)

32

15.

C8H10N4O2 has how many elements?

a)

24

b)

4

c)

1

16.

C8H10N4O2 has how many hydrogens?

a)

1

b)

2

c)

4

d)

10

17.

A capital letter or combination of a capital letter and a small letter that is used to represent an element is called a(n) ________

a)

element

b)

subscript

c)

coefficient

18.

Which is an element?

a)

2

b)

H

c)

3

19.

How many atoms are there TOTAL in H2SO4

a)

6

b)

5

c)

7

20.

How many Oxygen atoms are in H2O?

a)

1

b)

2

c)

0

21.

How many atoms of Hydrogen are in this compound?

a)

1

b)

2

c)

3

d)

4

22.

How many Oxygen atoms are in Al₂(SO₄)₃?

a)

4

b)

12

c)

7

d)

24

23.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
24.

What elements are in this compound?

a)

Nitrogen

b)

Carbon

c)

Oxygen

d)

Iron

e)

Neon

25.

What elements are in this compound?

a)

Carbon

b)

Hydrogen

c)

Oxygen

d)

Calcium

e)

Cobalt

26.
Element or compound?
O2
a)
Element
b)
Compound
27.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
28.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
29.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
30.
What cannot be broken down into other substances?
a)
Compound
b)
Mixture
c)
Solids
d)
Element
31.

What is made up two or more DIFFERENT elements that are chemically combined?

a)

Element

b)

Mixture

c)

Compound

d)

Solids

32.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
33.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
34.
Element or Compound?
H2SO4
a)
Element
b)
Compound
35.

How many different elements are in this compound?

a)

1

b)

2

c)

3

d)

4

36.

How many DIFFERENT elements are represented in this compound?

a)

3

b)

4

c)

5

d)

6

37.

Is this an example of an element or compound?

a)

element

b)

compound

38.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
39.
What cannot be broken down into other substances?
a)
Compound
b)
Mixture
c)
Solids
d)
Element
40.
Contains only one kind of atom.
a)
Element
b)
Compund
c)
Mixture
41.
Contains two or more atoms combined
a)
Elements
b)
Compounds
c)
Mixtures
42.

All of the following are compounds EXCEPT:

a)

hydrogen

b)

sodium chloride

c)

water

d)

carbon dioxide

43.

Compounds have ----- than the original elements that make them up.

a)

different properties

b)

prettier colors

c)

longer names

d)

different symbols

44.

Which of the following are true about compounds?

a)

They are represented with multiple element symbols together

b)

They contain subscripts

c)

They are represented on the periodic table

d)

They are in things we use everyday

45.

This picture represents which of the following?

a)

element

b)

compound

46.

This picture represents which of the following?

a)

element

b)

compound

47.

This picture represents which of the following?

a)

element

b)

compound

48.

This picture represents which of the following?

a)

element

b)

compound

49.

What is gold? It is found on the Periodic Table with the symbol, Au.

a)

element

b)

compound

50.

Elements are classified as pure substances.

a)

True

b)

False

51.

This picture is a model of...

a)

an element

b)

a compound

c)

a homogenious mixture

d)

a heterogeneous mixture.

52.

Oxygen and iron combine chemically to form rust. Rust is classified as which of the following?

a)

an atom.

b)

an element.

c)

a compound.

d)

a mixture.

53.

______ is a pure substance containing two or more kinds of atoms.

a)

Element

b)

compound

c)

mixture

d)

solution

54.

Baking Soda (NaHCO₃)

a)

element

b)

compound

c)

mixture

55.

Copper (Cu)

a)

element

b)

compound

c)

mixture

56.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds
57.
Classify the picture with the correct label.
a)
Element
b)
Compound
c)
Mixture of Elements
d)
Mixture of Compounds
58.
Classify the picture with the correct label.
a)
Element
b)
Compound
c)
Mixture of Compounds
d)
Mixture of Elements
59.

Gold is an element so that means that gold contains

a)

one kind of compound

b)

one type of atom

c)

a mixture of many types of atoms

d)

a mixture of many compounds

60.

Which of the following chemical formula represents an element?

a)

CC  

b)

H2OH_2O  

c)

NaClNaCl  

d)

  NH3NH_3  

61.

Which of the following is a chemical formula for a compound?

a)

H2H_2

b)

Cl2Cl_2

c)

NH3NH_3

d)

F2F_2

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